1/2"x 13 (NC) threaded holes for attaching your weight. They tightly secure any weight or ballast to your vehicle's chassis, improving stability and performance.
Weight Mount Clamps 2" Ballast Clamps -Set of 5 Black Aluminum IMCA
Steel Ballast Mount Clamp 1-1/2 Weight mount IMCA Dirt Car UMP Dirt Modified
ROUND WEIGHT MOUNT 1-1/2"
ROUND WEIGHT MOUNT 1-3/4"
ROUND WEIGHT MOUNT 1-1/4"
Universal Aluminum Ballast Weight Mount Clamp Bracket 2.00" Round Roll Bar Tube